Viewing file:  apr_reslist.h (6.14 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
#ifndef APR_RESLIST_H
#define APR_RESLIST_H
/**
* @file apr_reslist.h
* @brief APR-UTIL Resource List Routines
*/
#include "apr.h"
#include "apu.h"
#include "apr_pools.h"
#include "apr_errno.h"
#include "apr_time.h"
#if APR_HAS_THREADS
/**
* @defgroup APR_Util_RL Resource List Routines
* @ingroup APR_Util
* @{
*/
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/** Opaque resource list object */
typedef struct apr_reslist_t apr_reslist_t;
/* Generic constructor called by resource list when it needs to create a
* resource.
* @param resource opaque resource
* @param param flags
* @param pool Pool
*/
typedef apr_status_t (*apr_reslist_constructor)(void **resource, void *params,
apr_pool_t *pool);
/* Generic destructor called by resource list when it needs to destroy a
* resource.
* @param resource opaque resource
* @param param flags
* @param pool Pool
*/
typedef apr_status_t (*apr_reslist_destructor)(void *resource, void *params,
apr_pool_t *pool);
/**
* Create a new resource list with the following parameters:
* @param reslist An address where the pointer to the new resource
* list will be stored.
* @param pool The pool to use for local storage and management
* @param min Allowed minimum number of available resources. Zero
* creates new resources only when needed.
* @param smax Resources will be destroyed to meet this maximum
* restriction as they expire.
* @param hmax Absolute maximum limit on the number of total resources.
* @param ttl If non-zero, sets the maximum amount of time a resource
* may be available while exceeding the soft limit.
* @param con Constructor routine that is called to create a new resource.
* @param de Destructor routine that is called to destroy an expired resource.
* @param params Passed to constructor and deconstructor
* @param pool The pool from which to create this resoure list. Also the
* same pool that is passed to the constructor and destructor
* routines.
*/
APU_DECLARE(apr_status_t) apr_reslist_create(apr_reslist_t **reslist,
int min, int smax, int hmax,
apr_interval_time_t ttl,
apr_reslist_constructor con,
apr_reslist_destructor de,
void *params,
apr_pool_t *pool);
/**
* Destroy the given resource list and all resources controlled by
* this list.
* FIXME: Should this block until all resources become available,
* or maybe just destroy all the free ones, or maybe destroy
* them even though they might be in use by something else?
* @param reslist The reslist to destroy
*/
APU_DECLARE(apr_status_t) apr_reslist_destroy(apr_reslist_t *reslist);
/**
* Retrieve a resource from the list, creating a new one if necessary.
* If we have met our maximum number of resources, we will block
* until one becomes available.
*/
APU_DECLARE(apr_status_t) apr_reslist_acquire(apr_reslist_t *reslist,
void **resource);
/**
* Return a resource back to the list of available resources.
*/
APU_DECLARE(apr_status_t) apr_reslist_release(apr_reslist_t *reslist,
void *resource);
#ifdef __cplusplus
}
#endif
/** @} */
#endif /* APR_HAS_THREADS */
#endif /* ! APR_RESLIST_H */
|